﻿522 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  hh 
  Lateral 
  spiues 
  of 
  the 
  ninth 
  segment 
  straight 
  on 
  the 
  inner, 
  but 
  incurvate 
  

   on 
  their 
  outer 
  margins 
  

   c 
  Lateral 
  spines 
  of 
  the 
  eighth 
  segment 
  thin, 
  flat 
  and 
  sharp, 
  attaining 
  the 
  

   level 
  of 
  the 
  apical 
  margin 
  of 
  the 
  ninth 
  segment 
  on 
  the 
  middorsal 
  line 
  

  

  vieinum 
  

   CO 
  Lateral 
  spines 
  of 
  the 
  eighth 
  segment 
  stouter, 
  their 
  tips 
  hardly 
  surpassing 
  

  

  the 
  middle 
  of 
  the 
  dorsum 
  of 
  the 
  ninth 
  segment 
  ^. 
  semicintum 
  

  

  aa 
  Dorsal 
  hooks 
  of 
  abdominal 
  segments 
  6-8 
  shorter 
  than 
  the 
  segments 
  bearing 
  

   them, 
  andlesspointed. 
  assimilat 
  um, 
  rubicundulum, 
  obtrusum 
  

  

  Sympetrum 
  costiferum 
  Hagen 
  

  

  Figure 
  30 
  

   1861 
  Diplax 
  costifera 
  Hagen, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  175 
  

   1895 
  Diplax 
  costifera 
  Calvert, 
  N. 
  Y. 
  ent. 
  soc. 
  Jour. 
  3:48 
  (listed 
  from 
  

   Amherst) 
  

  

  This 
  species 
  came 
  up 
  quite 
  unexpectedly 
  in 
  one 
  of 
  my 
  breeding 
  cages 
  

   at 
  Saranac 
  Inn. 
  I 
  had 
  collected 
  a 
  number 
  of 
  nymphs 
  from 
  the 
  shore 
  of 
  

   Little 
  Clear 
  pond 
  near 
  the 
  outlet, 
  and 
  put 
  them 
  in 
  this 
  cage, 
  supposing 
  

   them 
  to 
  be 
  of 
  one 
  species; 
  they 
  yielded 
  at 
  transformation 
  imagos 
  of 
  

   S. 
  vieinum, 
  but 
  one 
  nymph 
  yielded 
  a 
  fine 
  male 
  specimen 
  of 
  this 
  

   species. 
  It 
  is 
  the 
  one 
  from 
  which 
  the 
  characters 
  stated 
  herewith 
  are 
  

   drawn. 
  No 
  imagos 
  were 
  seen 
  at 
  large. 
  This 
  one 
  appeared 
  on 
  August 
  8. 
  

   The 
  cast 
  skin 
  was 
  left 
  in 
  a 
  somewhat 
  collapsed 
  condition, 
  so 
  that 
  it 
  is 
  

   hard 
  to 
  measure 
  accurately; 
  but 
  the 
  measurements 
  are, 
  as 
  nearly 
  as 
  

  

  I 
  can 
  make 
  out, 
  as 
  follows: 
  total 
  length 
  14.5 
  mm; 
  abdomen, 
  9 
  mm; 
  

   hind 
  femur 
  5 
  mm 
  ; 
  width 
  of 
  head 
  5 
  mm, 
  of 
  abdomen, 
  6 
  mm. 
  

  

  The 
  eyes 
  are 
  a 
  trifle 
  less 
  prominent 
  than 
  in 
  S. 
  vieinum; 
  there 
  are 
  

  

  II 
  lateral 
  setae, 
  and 
  about 
  13 
  mental 
  setae, 
  of 
  which 
  the 
  fifth, 
  counting 
  

   from 
  the 
  side, 
  is 
  longest, 
  the 
  movable 
  hook 
  is 
  somewhat 
  shorter 
  and 
  

   thicker 
  than 
  in 
  S. 
  vieinum, 
  and 
  the 
  teeth 
  are 
  more 
  nearly 
  obsolete; 
  

   the 
  lateral 
  spines 
  of 
  the 
  eighth 
  abdominal 
  segment 
  are 
  about 
  half 
  as 
  long 
  

   as 
  is 
  that 
  segment; 
  those 
  of 
  the 
  ninth 
  segment 
  are 
  much 
  longer, 
  slender, 
  

   straight 
  on 
  both 
  margins, 
  and 
  their 
  tips 
  scarcely 
  attain 
  the 
  level 
  of 
  the 
  

   tips 
  of 
  the 
  appendages. 
  The 
  superior 
  appendage 
  is 
  scarcely 
  shorter 
  than 
  

   the 
  inferiors, 
  but 
  these 
  laterally 
  are 
  less 
  than 
  one 
  half 
  as 
  long. 
  

  

  Sympetrum 
  vieinum 
  Hagen 
  

  

  Figure 
  30 
  

  

  1861 
  Diplax 
  vicina 
  Hagen, 
  Synopsis 
  Neur. 
  N. 
  Am. 
  p. 
  175 
  

   1893 
  Diplax 
  vicina 
  Calvert, 
  Am. 
  ent. 
  soc. 
  Trans. 
  20:264 
  (description 
  and 
  

   figure) 
  

  

  